Agent skill

ln-011-agent-installer

Installs or updates Codex CLI, Gemini CLI, and Claude Code to latest versions. Use when CLI agents need installation or update.

View SKILL.md on GitHub Repository
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Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/ln-011-agent-installer

SKILL.md

Paths: File paths (shared/, references/) are relative to skills repo root. Locate this SKILL.md directory and go up one level for repo root.

Agent Installer

Type: L3 Worker Category: 0XX Shared

Installs or updates CLI agents (Codex, Gemini) via npm and updates Claude Code via its built-in command. Checks current state, performs install/update, verifies result.

Input / Output

Direction Content
Input OS info, disabled flags per agent, dry_run flag
Output Per-agent status: installed / updated / skipped / disabled / failed

Agent Registry

npm Agents

Agent npm Package Health Check
Codex @openai/codex codex --version
Gemini @google/gemini-cli gemini --version

Claude CLI

Agent Update Command Health Check
Claude claude update claude --version

Workflow

Check Current State  -->  Install/Update  -->  Verify

Phase 1: Check Current State

For each agent in the registry:

  1. Run {cmd} --version to detect installed version (first line of output)
  2. Build state table:
Current Agent State:
| Agent  | Installed | Version  |
|--------|-----------|----------|
| Codex  | yes       | 0.1.2503 |
| Gemini | no        | -        |
| Claude | yes       | 1.0.30   |

Phase 2: Install/Update

npm Agents (Codex, Gemini) -- for each agent, apply the first matching rule:

Condition Action Report
disabled: true SKIP "disabled by user"
dry_run: true Show planned command "dry run"
Any other state npm install -g {pkg} "installed/updated"

Claude CLI:

Condition Action Report
disabled: true SKIP "disabled by user"
dry_run: true Show planned command "dry run"
Any other state claude update "updated"

Error handling:

Error Detection Response
npm not in PATH npm --version fails FAIL gracefully, report "npm not found in PATH"
Permission denied npm exit code + stderr contains "EACCES" FAIL, suggest npm install -g --prefix ~/.local {pkg}
Network error npm exit code + stderr contains "ETIMEDOUT" or "ENETUNREACH" FAIL, report "network error - check connectivity"
Unknown error Any other non-zero exit FAIL, include stderr in report

Phase 3: Verify

  1. Re-run {cmd} --version for each agent that was installed/updated
  2. Confirm version output matches expected (non-empty, no error)
  3. Display final report:
Agent Installation:
| Agent  | Action    | Version  | Status |
|--------|-----------|----------|--------|
| Codex  | installed | 0.1.2503 | ok     |
| Gemini | skipped   | -        | disabled by user |
| Claude | updated   | 1.0.30   | ok     |

Critical Rules

  1. Never modify disabled flags. This skill respects them, never changes them
  2. Fail gracefully. One agent failure does not block the other
  3. Global install only. Always npm install -g (CLI tools must be in PATH)
  4. No side effects. Only npm global packages are touched. No config files modified
  5. Idempotent. Safe to run multiple times. npm install -g and claude update handle already-current versions gracefully

Anti-Patterns

DON'T DO
Install without checking current state Always check version first
Retry failed installs automatically One attempt, report failure
Use sudo npm install Suggest --prefix for permission issues
Install agents marked disabled Skip with clear report

Definition of Done

  • All agents checked (Codex, Gemini, Claude)
  • Disabled agents skipped with report
  • Install/update commands executed for eligible agents
  • Version verified after install/update
  • Final status table displayed

Version: 1.0.0 Last Updated: 2026-03-20

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